<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./vue.js"></script>
</head>
<body>
    <div id="app">{{content}}</div>
    <script>
        var app=new Vue({
            el:"#app",
            data:{
                content:"hello world",
            },           
        })
            setTimeout(function () {
                app.$data.content="this enough"  //$data指向data对象内容             
            },2000)
    </script>
</body>
</html>